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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43f98383193abd1f50504558c9298858365d7bbba24f9b127d1ebc546c8a0c69' 
  AND token = 'Sdn3zqnGBPTmOkdgtTkktUWm9vCkNoqDPhHAbAArTdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}